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Re: st: error codes returned by NL function evaluator program to use dummy variables


From   Nick Cox <njcoxstata@gmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: error codes returned by NL function evaluator program to use dummy variables
Date   Fri, 21 Jun 2013 18:04:37 +0100

On a quick read-through I noticed two bugs:

 scalar `drought_c = `at'[1, 6]

lacks a matching ' character.

 local `++atcnt'

is not what you want. It's

local ++atcnt

Nick
njcoxstata@gmail.com


On 21 June 2013 09:33, David Raitzer wrote:

> I am trying to use an nl function evaluator program to run a
> dummy-variable least squares nonlinear regression in Stata 10.1,
> because nl returns an "expression too long" error if I try to run the
> regression interactively.  The program that I coded is based on
> examples posted for a production function in Stata materials, as well
> as an example previously posted on the Statalist.
>
> However, it will not run, and continually returns the error "nlfe3
> returned 198 verify that nlfe3 is a function evaluator program".
> Other attempted permutations (where I add the panel identifier newid
> to the list of variables) shift the error code to 198.    The code is
> below.  Could somebody please suggest what needs to be corrected?

> program nlfe3
> version 10.1
> syntax varlist(min=15 max=15) if, at(name)
> args lyield lncert yearcount lnha lnirrignew drought flood  pestdum
> blast blb herbai tungro pestai pestaiBYbph bph
> tempname const cert year_c lnha_c irrig drought_c flood_c u blast_c
> blb_c herb_c tungro_c insectkg bph_ins bph_c
> tempvar kterm lterm
> scalar `const' = `at'[1, 1]
> scalar `cert' = `at'[1, 2]
> scalar `year_c' = `at'[1, 3]
> scalar `lnha_c' = `at'[1, 4]
> scalar `irrig' = `at'[1, 5]
> scalar `drought_c = `at'[1, 6]
> scalar `flood_c' = `at'[1, 7]
> scalar `u' = `at'[1, 8]
> scalar `blast_c' = `at'[1, 9]
> scalar `blb_c' = `at'[1, 10]
> scalar `herb_c' = `at'[1, 11]
> scalar `tungro_c' = `at'[1, 12]
> scalar `insectkg' = `at'[1, 13]
> scalar `bph_ins' = `at'[1, 14]
> scalar `bph_c' = `at'[1, 15]
> gen double `kterm' = `const'+`cert'*`lncert' + `year_c'*`yearcount' +
> `lnha_c'*`lnha' +`irrig'*`lnirrignew' +`drought_c'*`drought' +
> `flood_c'*`flood' `if'
> gen double `lterm' = `pestdum'*ln(1/(1 + exp(`u'-(1*`blast_c'*`blast'
> + `blb_c'*`blb' + `herb_c'*`herbai' + `tungro_c'*`tungro' +
> `insectkg'*`pestai' +`bph_ins'*`pestaiBYbph' +`bph_c'*`bph'))))  `if'
> replace `lyield' =  `kterm' + `lterm'  `if'
>
>         // Now loop over coefficients on newid indicators
>         local atcnt = 16                 // First element of `at' for
>                                         // newid is the sixteenth.
>         forvalues i = 1/519 {             // 519 levels of newid
>                 replace `lyield' = `lyield' +                         ///
>                                 `at'[1, `atcnt']*(newid == `i') `if'
>                 local `++atcnt'
>         }
>
> end
>
>
> nl fe3 @ lyield lncert yearcount lnha lnirrignew drought flood pestdum
> blast blb herbai tungro pestai pestaiBYbph bph, nparam(533)
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